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articles/azure-netapp-files/data-protection-disaster-recovery-options.md

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- Data availability and redundancy for remote data processing and user access
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- Efficient storage-based data replication without load on compute infrastructure
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To learn more, see [How volumes and snapshots are replicated cross-region for DR](snapshots-introduction.md#how-volumes-and-snapshots-are-replicated-cross-region-for-disaster-recovery-and-business-continuity). To get started with cross-region replication, see [Create cross-region replication for Azure NetApp Files](cross-region-replication-create-peering.md).
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To learn more, see [How volumes and snapshots are replicated cross-region for DR](snapshots-introduction.md#how-volumes-and-snapshots-are-replicated-for-disaster-recovery-and-business-continuity). To get started with cross-region replication, see [Create cross-region replication for Azure NetApp Files](cross-region-replication-create-peering.md).
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## Cross-zone replication
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articles/azure-netapp-files/manage-cool-access.md

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* To prevent data retrieval from the cool tier to the hot tier during sequential read operations (for example, antivirus or other file scanning operations), set the cool access retrieval policy to **Default** or **Never**. For more information, see [Enable cool access on a new volume](#enable-cool-access-on-a-new-volume).
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* After the capacity pool is configured with the option to support cool access volumes, the setting can't be disabled at the _capacity pool_ level. You can turn on or turn off the cool access setting at the _volume_ level anytime. Turning off the cool access setting at the volume level stops further tiering of data. 
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* Files moved to the cool tier remains there after you disable cool access on a volume. You must perform an I/O operation on _each_ file to return it to the warm tier.
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* You can't use [large volumes](large-volumes-requirements-considerations.md) with cool access.
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* For the maximum number of volumes supported for cool access per subscription per region, see [Resource limits for Azure NetApp Files](azure-netapp-files-resource-limits.md#resource-limits).
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* Considerations for using cool access with [cross-region replication](cross-region-replication-requirements-considerations.md) and [cross-zone replication](cross-zone-replication-introduction.md):
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* The cool access setting on the destination volume is updated automatically to match the source volume whenever the setting is changed on the source volume or during authorization. The setting is also updated automatically when a reverse resync of the replication is performed, but only if the destination volume is in a cool access-enabled capacity pool. Changes to the cool access setting on the destination volume don't affect the setting on the source volume.

articles/azure-netapp-files/snapshots-introduction.md

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* Snapshot policies, via the [Azure portal](snapshots-manage-policy.md), [REST API](/rest/api/netapp/snapshotpolicies), [Azure CLI](/cli/azure/netappfiles/snapshot/policy), or [PowerShell](/powershell/module/az.netappfiles/new-aznetappfilessnapshotpolicy) tools
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* Application consistent snapshot tooling such as [AzAcSnap](azacsnap-introduction.md) or third-party solutions
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## How volumes and snapshots are replicated cross-region for disaster recovery and business continuity
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## How volumes and snapshots are replicated for disaster recovery and business continuity
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Azure NetApp Files supports [cross-region replication](cross-region-replication-introduction.md) for disaster-recovery (DR) purposes and [cross-zone replication](cross-zone-replication-introduction.md) for business continuity. Azure NetApp Files cross-region replication and cross-zone replication both use SnapMirror technology. Only changed blocks are sent over the network in a compressed, efficient format. After replication is initiated between volumes, the entire volume contents (that is, the actual stored data blocks) are transferred only once. This operation is called a *baseline transfer*. After the initial transfer, only changed blocks (as captured in snapshots) are transferred. The result is an asynchronous 1:1 replica of the source volume, including all snapshots. This behavior follows a full and incremental-forever replication mechanism. This technology minimizes the amount of data required for replication, therefore saving data transfer costs. It also shortens the replication time. You can achieve a smaller Recovery Point Objective (RPO), because more snapshots can be created and transferred more frequently with minimal data transfers. Further, it takes away the need for host-based replication mechanisms, avoiding virtual machine and software license cost.
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